Year	Percent
1990	6.241
1991	6.342
1992	7.786
1993	9.831
1994	12.15
1995	13.85
1996	13.812
1997	13.203
1998	12.17
1999	11.48
2000	9.54
2001	7.899
2002	6.519
2003	5.367
2004	4.409
2005	3.615
2006	2.959
2007	2.42
2008	2.591
2009	2.774
2010	2.969
2011	3.177
2012	3.4
2013	3.3
2014	2.6
2015	4.9
2016	5.4
2017	5.164
2018	4.929
2019	4.693
2020	4.458
2021	4.222
2022	3.987
2023	3.751
2024	3.516
2025	3.28
2026	3.045
2027	2.809
2028	2.574
2029	2.338
2030	2.103